Aid agencies warn the situation this year is beginning to resemble its 2011 famine, when more than a quarter of a million people died.
A UN-backed food security report said South Sudan is no longer classified as being in famine, although the situation is still critical and millions face food insecurity.
The outbreak coupled with famine is an indication things are "falling apart." Only 29 percent of a massive humanitarian plan for Yemen in 2017 has been funded, says a UN coordinator.
While many Muslims around the world celebrate the holy month, millions in Yemen observe their fasts facing starvation and health woes, as the civil war in the country continues with no end it sight.
Yemen has witnessed over 10,000 deaths due to the two-year civil war with no end in sight. Now the outbreak of cholera is adding to the death toll in a country that is already at the brink of famine.
The disease is suspected to have left some 8,500 people ill in over two weeks as hospitals struggle to cope with an influx of patients, the Red Cross says.
This emerged at an international conference on Somalia in London that is looking how to accelerate progress on security, development and the economy by 2020. The country in the Horn of Africa faces pressing security and humanitarian issues.
The London Somalia Conference 2017 is expected to focus on all these issues as it brings together stakeholders to examine ways to reform the security sector and improve response to the country's humanitarian crises.
The World Food Programme aid worker had been detained by the government of South Sudan since April 10. Other aid workers have also been detained since civil war broke out in 2013 in the world's youngest nation.
UN agency says some 6.2 million Somalis are in need of humanitarian assistance.
Somalia's president says his government is unable to deal with the crisis, and those displaced say camps are their last chance of survival.
A third of Yemen's 22 provinces are on the brink of famine, with 60 percent of the country's population going hungry. The UN says the situation in Yemen is "the largest humanitarian crisis in the world."
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